Abstract
THE part of the mantle edge of Tridacna which is reflected upwards and forwards round the exhalant chamber is highly muscular, greatly thickened and harbours myriads of zooxanthellæ (7 µ each) in the connective tissue. During the study of the food and feeding habits of this form1, it was noticed that appreciable numbers of free zooxanthellæ invariably occur in the stomach, especially of big specimens. The presence of zooxanthellæ in the stomach of Tridacna was previously recorded by Boschma2 and Yonge3. The latter author concluded that such zooxanthellæ were introduced accidentally through handling after the animal was opened for examination.
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